Electric heating-coil.



G. G. LILLIBRIDGE. ELEOTEIG HEATING 0011..

APPLICATION FILED JULY 21, 1913.

1,100,585, Patented June 16,1914.

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UNITED sTA'rEsra rnNT OFFICE.

CURTIS C. LILLIBRIDGE, OF HUTCHINSON. KANSAS.

ELECTRIC HEATING-C011).

Specification of Letters Patent.

Application filed July 21, 1913.

Yatcntod June 16, 1914. Serial No. 780,328.

the art to which it appertains to make and use the same.

This invention relates to improvements in electric heating coils.

One object of the invention is to provide an electric heating coil having an improved construction and arrangement of insulating or non-conducting plates which are bound to a combustible separating and spacing material by the current conducting coil, said combustible separatin; material being carbonized or burnt up by the heat generated from the coil, thus forming a space between the nonconducting sheets or plates in which the ashes from the burnt paper are disposed, said space preventing the coil from becoming overheated while the paper ashes remaining between the two sheets or plates act as l heat resistance as well as an insulator, thus saving the use of mica or other form of insu lator and producing much better results than a solid core of mica or other insulation.

Another object is to provide an electric heating coil which may be a rrangcil in (lit? ferent Ways for use in various kinds and shapes of electric heating elements or electrically heated devices.

\Vith these and other objects in view, the invention consists of certain. novel features of construction, and the combination and arrangement of pa rts as will be more fully described and claimed.

In the accompanying drawings: Figure l, is a perspective view of one of my improved electric heating coils; Fig. 2 is a longitudinal section thereof; Fig. 3 is a cross section of the same; Fig. 4 is a side View of a por tion of a slightly modified form of the coil; Fig. 5 is a plan view of one form of an electrichcatin element showing the top plate thereof broken away and illustrating one application and arrangement of my im-- proved heating coil; Fig. 6 is av cross tional view thereof taken on the line K -6 of Fig. 5.

In the embodiment of the invention l provide plates or sheets 1 which are preferably constructed of mica but which may be porcclain or any other suitable noudominating, lire-proof or heat r ii-1;}: material. The plates in! sheets 1 may .1. he of any desired size and shape the some being here -ehown as constru tml n the fili'lfl of long narrow strips and as prctembly having; in their opposite tftlQ' series ol' notche If a? =hown in Fig. l oi the drawn) but which if desired may be our ed without the non-hes as shown in l y l of the droning. "lhc pur- Dose of the notches will he hereinafter do scriinad. 'lhc plates or shoots l are sop-- oral :l or spaced apart y strips or pieces 9 of combustible material which are prel m ably in the f rm of blotl log paper. but which may be of any suitable mahrrial capable of beingronsumcd or mirb uiz rd under the action of the heat produced by the coil. The plates or sheets ,i and the strips are bound by the crrrrnt conducting wire or tape 4 and thus form the core oi the veil wound th reon. The current conducting}; tape or wire 4 wound spirally around the rill ("WIS l and when the latter are notched the coils of the wire re engaged with the notches and are thus held in evenly spaced tiflrltlOIL shown in Fig. l of the drawing; in thus constructing the coil the paper or comimstible strip between the plates or sheets 1 will he consunaal or carbonized by the heat produced from. the electric current when sent through the wire or tape -13 of the coil and when the strips 3 are thus burned a space is: left between the oonrondu .ing and non conilmstible plates l wh h will pit-yr t the coil from b coming overheated whi aycr of burnt orrarboniPed paper int: between the plate. or sheets i. a heat r Stlllgt"tll1('lll which not, the use of additional slice of insohating ma tcrial but has been toondlto he a great improvement over a solid ore o t mm; or other insulating material.

irly improved alls when 'z-onstructcd as herein shown and dci ztrihetl may be our ployed in com'n-ction with any electrically heated appliances and may e arranged various ways to accountiodatc the same to the use of different shapes and s of electrical heating elen'icnts. In Figs. 5 and G the coils are shown as arranged for use in connection with a t"lll-il1kl heating element or hot plate t and when thus used three coils are preferably employed and are arranged in n istantially triangular form beill) tween upper and lower plates 5 of copper or other suitable material which form a casing for the coils. The edges of the plates 5 are turned inwardly to provide right angular flanges 6 which form the side edges of the casing. The plates 5 are fastened together in any suitable manner to form the casing, the same being shown in the present instance as being connected by rivets 7 arranged therethrough adjacent to the inner sides of the adjoining ends of the coils. The triangular or other shaped space between the coils when arranged in the manner described is preferably tilled by a core 8 of suitable in-' sulating material.

The free ends of the wires from the coil are connected at a suitable point in the easing to terminal strips 9 of copper or other suitable material which are separated by sheets 10 of mica or other suitable material from the upper and lower plates of the casing, the outer ends of said terminal strips having suitable binding posts or other connections for the ends of the current conducting wires to which the heating element is connected.

By arranging the coils in a casing as shown in Figs. 5 and 6 of the drawings they may be conveniently handled and readily applied to the hot plates or other parts of electric cookers or ranges and to any other forms of electrically heated appliances.

From the foregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Having thus described my invention, what I claim is:

1. An electric heating coil comprising sheets of non-conducting and non-combustible material, a current conducting wire coiled around said sheets, and ash made from strips of combustible material clamped between said sheets.

2. An electric heating coil comprising strips of mica having registering notches in their edges, a current conducting element coiled around said strips and lying within said notches, and an ash clamped between said strips and constituting a core holding such strips separated.

3. An electric heating element comprising a casing consisting of upper and lower plates, heating coils arranged between said plates, said coils comprising spaced noncombustible sheets of insulating material, current conducting wires coiled around said sheets, carbonized strips disposed between said sheets, and an insulating core arranged between said plates of the casing and Within the inclosure formed by said coils.

In testimony whereof I have hereunto set my hand n1 presence of two subscribing witnesses.

CURTIS C. LILLIBRIDGE. \Vitnesses:

J. M. STEWART, C. \V. MCDANIEL. 

